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题库 / GMATLA-CR-3
Smithtown University's fund-raisers succeeded in getting donations from 80 percent of the potential donors they contacted. This success rate, exceptionally high for university fund-raisers, does not indicate that they were doing a good job. On the contrary, since the people most likely to donate are those who have donated in the past, good fund-raisers constantly try less-likely prospects in an effort to expand the donor base. The high success rate shows insufficient canvassing effort.
Which of the following, if true, provides more support for the argument?
Smithtown University's fund-raisers were successful in their contacts with potential donors who had never given before about as frequently as were fund-raisers for other universities in their contacts with such people.
This year the average size of the donations to Smithtown University from new donors when the university's fund-raisers had contacted was larger than the average size of donations from donors who had given to the university before.
This year most of the donations that came to Smithtown University from people who had previously donated to it were made without the university's fund-raisers having made any contact with the donors.
The majority of the donations that fund-raisers succeeded in getting for Smithtown University this year were from donors who had never given to the university before.
More than half of the money raised by Smithtown University's fund-raisers came from donors who had never previously donated to the university.
前提：（果）80%成功率，曾捐助过的人往往会再捐。
结论：（因）游说不努力，才导致了高成功率。
A选项取非，即SU fund-raiser说服未捐助过的人的成功概率和其它学校的fund-raiser不一样。
如果SU说服未捐助的人的成功概率高，对原文推理是削弱；如果SU说服未捐助的人的成功概率低，那么为达到80%的成功率，说服曾捐助的人的成功率就要高，对原文也是一个削弱。
C选项与原文推理无关。大部分钱是曾捐助人未接到联络就捐了，这个事实不影响fund-raiser的游说和成功率。
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